Firewall Grommet, 1 Hole, 3" OD, 1" ID, Aluminum / Rubber, Black, Seals-It GS100316 Grommet seals have many applications such as racecars to help keep the unwanted smoke and fumes from entering the driver's area while protecting lines from chafing on rough surfaces. In hot rods and custom car applications they provide the perfect finishing touch. Seals-it grommet seals will give your car that professional appearance you want. Grommet seals have many applications including marine, commercial equipment, motor homes, airplanes and more...